The Biggest Little City in the World is about to get a new neighbor: the biggest lithium battery factory in the world that Nevada Gov. Brian Sandoval asserted will create more than 22,000 new jobs and pump $100 billion into the state's economy over the next 20 years.

To bring electric cars to the masses, Tesla Motors will use an expanse of desert where wild mustangs still roam for a factory that the company projects will crank out enough batteries to power 500,000 vehicles annually by decade's end.

A litigious libertarian think tank has asked the president of the state’s largest utility to account for the company’s political activity, and specifically whether the utility’s customers have been funding its electioneering or lobbying.

Arizona will ask federal regulators this week to rethink their June proposal that calls for the state to cut carbon emissions from power plants in half over the next 15 years.Arizona will ask federal regulators this week to rethink their June proposal that calls for the state to cut carbon emissions from power plants in half over the next 15 years.

In a company blog, the chief of Arizona’s largest utility company lashed out at the political advocacy arm of residential solar companies and highlighted the Arizona Corporation Commission candidates the group is supporting.

Zero down? Check. No credit score? Not a problem. Guaranteed savings? Of course! There is a new kid on the rooftop solar block, and it’s a century-old company called Arizona Public Service. The state’s largest utility company is turning an ...

Arizona Public Service, the state's largest utility, today asked the Arizona Corporation Commission to let it to directly install solar rooftops on 3,000 homes to produce 20 megawatts of energy. If approved, the proposal would position APS to more forcefully compete with rooftop solar firms and potentially eat into their market share.